Socket Head Cap Screws: Dimensions and Specifications

Labeled diagram of socket head cap screw

Standard Socket Head Cap Screw Dimensions (Alloy & Stainless Steel)                                                                                                     ASME B18.3-2003
Basic Screw Diameter

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 Body Diameter (D)  Head Diameter (A) Head Height (H) Top Chamfer or Radius (C) Hex Socket Size (J)  Fillet Juncture Diameter at Bearing Surface (F)  Key Engage-ment (T) Wall Thick-ness (G) Bottom Chamfer or Radius (K)
Max Min Max Min Max Min Max  Nom  Max Min  Min Min  Max
0 0.0600 0.0568 0.096 0.091 0.060 0.057 0.004 0.050 0.074 0.062 0.025 0.020 0.007
1 0.0730 0.0695 0.118 0.112 0.073 0.070 0.005 1/16 0.087 0.075 0.031 0.025 0.007
2 0.0860 0.0822 0.140 0.134 0.086 0.083 0.008 5/64 0.102 0.090 0.038 0.029 0.007
3 0.0990 0.0949 0.161 0.154 0.099 0.095 0.008 5/64 0.115 0.102 0.044 0.034 0.007
4 0.1120 0.1075 0.183 0.176 0.112 0.108 0.009 3/32 0.130 0.117 0.051 0.038 0.008
5 0.1250 0.1202 0.205 0.198 0.125 0.121 0.012 3/32 0.145 0.132 0.057 0.043 0.008
6 0.1380 0.1329 0.226 0.218 0.138 0.134 0.013 7/64 0.158 0.144 0.064 0.047 0.008
8 0.1640 0.1585 0.270 0.262 0.164 0.159 0.014 9/64 0.188 0.172 0.077 0.056 0.008
10 0.1900 0.1840 0.312 0.303 0.190 0.185 0.018 5/32 0.218 0.202 0.090 0.065 0.008
1/4 0.2500 0.2435 0.375 0.365 0.250 0.244 0.025 3/16 0.278 0.261 0.120 0.095 0.010
5/16 0.3125 0.3053 0.469 0.457 0.312 0.306 0.033 1/4 0.347 0.329 0.151 0.119 0.010
3/8 0.3750 0.3678 0.562 0.550 0.375 0.368 0.040 5/16 0.415 0.397 0.182 0.143 0.010
7/16 0.4375 0.4294 0.656 0.642 0.438 0.430 0.047 3/8 0.484 0.465 0.213 0.166 0.015
1/2 0.5000 0.4919 0.750 0.735 0.500 0.492 0.055 3/8 0.552 0.531 0.245 0.190 0.015
5/8 0.6250 0.6163 0.938 0.921 0.625 0.616 0.070 1/2 0.689 0.664 0.307 0.238 0.015
3/4 0.7500 0.7406 1.125 1.107 0.750 0.740 0.085 5/8 0.828 0.800 0.370 0.285 0.015
7/8 0.8750 0.8647 1.312 1.293 0.875 0.864 0.100 3/4 0.963 0.932 0.432 0.333 0.020
1 1.0000 0.9886 1.500 1.479 1.000 0.988 0.114 3/4 1.100 1.068 0.495 0.380 0.020
1-1/4 1.2500 1.2336 1.875 1.852 1.250 1.236 0.144 7/8 1.370 1.333 0.620 0.475 0.020
1-1/2 1.5000 1.4818 2.250 2.224 1.500 1.485 0.176 1 1.640 1.601 0.745 0.570 0.020
Socket Cap Screws : Nominal Thread Length

Tolerance on Length

 Nominal Screw Size
 Nominal Screw Length
Up to 1" Over 1" - 2-1/2" Over 2-1/2" - 6"  Over 4" - 6"
0 thru 3/8 -.03 -.04 -.06 -.12
7/16 thru 3/4 -.03 -.06 -.08 -.12
7/8 thru 1-1/2 -.05 -.10 -.14 -.20
Mechanical Properties of Socket Cap Screws - Alloy and Stainless Steel

Nominal Size

Tensile Strength (lbs., min)

Yield Strength (lbs., min)

 Body Section Tightening Torque (in. - lbs.)
UNRC UNRF UNRC UNRF Single Shear Strength (lbs., min.) UNRC UNRF
Alloy Stainless Alloy Stainless Alloy Stainless Alloy Stainless Alloy Stainless Alloy Stainless Alloy Stainless
0 - - 320 145 - - 290  72 305  130 - -

2.6

 1.4 
1 475 - 500 220 425 - 450 111 450 190 4.5 - 4.8 2.3
2 665 295 710 - 600 185 635 - 625 260 7.5 3.8 8.0 -
3 875 - 940 - 790 - 845 - 830 - 11.0 - 12.0 -
4 1,090 480 1,190 - 975 240 1,070 - 1,060 350 16.0 6.0 18.0 -
5 1,430 - 1,490 - 1,290 - 1,345 - 1,325 - 24.0 - 24.0 -
6 1,640 725 1,825 - 1,470 363 1,645 - 1,615 375 30.0 15.0 34.0 - 
8 2,520 1,120 2,650 - 2,270 560 2,385 - 2,280 670 55.0 28.0 58.0 -
10 3,150 1,400 3,600 1,600 2,835 701 3,240 800 3,060 950 79.0 40.0 90.0 46.0
1/4 5,725 2,550 6,550 2,910 5,150 1,273 5,900 1,455 5,295 2,200 200.0 95.0 230.0 109.0
5/16 9,430 4,200 10,440 4,645 8,490 2,100 9,395 2,230 8,285 3,450 415.0 170.0 460.0 188.0
3/8 13,950 6,100 15,805 7,025 12,555 3,100 14,225 3,510 11,910 4,970 740.0 301.0 845.0 341.0
7/16 19,135 - 21,365 - 17,220 - 19,230 - 16,200 - 1,190.0 - 1,305.0 -
1/2 25,540 11,350 28,780 - 22,990 5,675 25,905 - 21,175 8,840 1,800.0 750.0 2,065.0 -
5/8 38,400 - 43,500 - 34,550 - 39,150 - 31,300 - 3,400.0 - 3,800.0 -
3/4 56,750 - 63,400 - 51,100 - 57,050 - 45,050 - 6,000.0 - 6,750.0 -
7/8 78,500 - 86,500 - 70,700 - 77,850 - 61,350 - 8,250.0 - 9,200.0 -
1 103,000 - 112,700 - 92,700 - 101,450 - 80,100 - 12,500.0 - 13,000.0 -
1-1/4 164,700 - 182,400 - 148,250 - 164,150 - 125,100 - 25,000.0 - 27,750.0 -
1-1/2 238,800 - 268,800 - 215,950 - 241,900 - 180,200 - 43,500.0 - 49,000.0 -

Labeled diagram of socket cap screw lengths.

Body and Grip Lengths of Standard Head Socket Cap Screws                                                                                                                             ASME B18.3-2003
Nominal Size (D) 0 1 2 3 4 5 6 8 10 1/4 5/16 3/8 7/16 1/2 5/8 3/4 7/8 1
 Basic Thread Length (LT) 0.500 0.625 0.625 0.625 .750 .750 .750 .875 .875 1.000 1.125 1.250 1.375 1.500 1.750 2.000 2.250 2.500
Nominal Length (L) LG LB LG LB LG LB LG LB LG LB LG LB LG LB LG LB LG LB LG LB LG LB LG LB LG LB LG LB LG LB LG LB LG LB LG LB
1.00 0.50 0.44 0.25 0.17 0.25 0.16 0.25 0.15 0.25 0.12 0.25 0.12                                                
1.25 0.75 0.69 0.62 0.55 0.62 0.54 0.62 0.52 0.25 0.12 0.25 0.12 0.50 0.34 0.38 0.22 0.38 0.17                                    
1.50     0.88 0.80 0.88 0.79 0.88 0.77 0.75 0.62 0.75 0.62 0.50 0.34 0.38 0.22 0.38 0.17 0.50 0.25                                
1.75         1.12 1.04 1.12 1.02 0.75 0.62 0.75 0.62 1.00 0.84 0.88 0.72 0.88 0.67 0.50 0.25 0.62 0.35 0.50 0.19                        
2.00             1.38 1.27 1.25 1.12 1.25 1.12 1.00 0.84 0.8 0.72 0.88 0.67 1.00 0.75 0.62 0.35 0.50 0.19 0.62 0.27                    
2.25                 1.25 1.12 1.25 1.12 1.50 1.34 1.38 1.22 1.38 1.17 1.00 0.75 1.12 0.85 1.00 0.69 0.62 0.27 0.75 0.36                
2.50                     1.75 1.62 1.50 1.34 1.38 1.22 1.38 1.17 1.50 1.25 1.12 0.85 1.00 0.69 1.12 0.77 0.75 0.36 0.75 0.30            
2.75                         2.00 1.84 1.88 1.72 1.88 1.67 1.50 1.25 1.62 1.35 1.50 1.19 1.12 0.77 0.75 0.36 0.75 0.30            
3.00                             1.88 1.72 1.88 1.67 2.00 1.75 1.62 1.35 1.50 1.19 1.62 1.27 1.50 1.12 0.75 0.30 1.00 0.50        
3.25                                 2.38 2.17 2.00 1.75 2.12 1.85 2.00 1.69 1.62 1.27 1.50 1.12 1.50 4.04 1.00 0.50 1.00 0.44    
3.50                                     2.50 2.25 2.12 1.85 2.00 1.69 2.12 1.77 1.50 1.12 1.50 1.04 1.00 0.50 1.00 0.44 1.00 0..38
4.00                                     3.00 2.75 2.62 2.35 2.50 2.19 2.62 2.27 2.25 1.86 2.25 1.80 2.00 1.50 1.00 0.44 1.00 0.38
4.50                                     3.50 3.25 3.12 2.85 3.00 2.69 3.12 2.77 3.00 2.62 2.25 1.80 2.00 1.50 2.00 1.44 2.00 1.38
5.00                                     4.00 3.75 3.62 3.35 3.50 3.19 3.62 3.27 3.00 2.62 3.00 2.54 3.00 2.50 2.00 1.44 2.00 1.38
5.50                                         4.12 3.85 4.00 3.69 4.12 3.77 3.75 3.36 3.75 3.30 3.00 2.50 3.00 2.44 3.00 2.38
6.00                                         4.62 4.35 4.50 4.19 4.62 4.27 4.50 4.12 3.75 3.30 4.00 3.50 3.00 2.44 3.00 2.38
6.50                                             5.00 4.69 5.12 4.77 4.50 4.12 4.50 4.04 4.00 3.50 4.00 3.44 4.00 3.38
7.00                                             5.50 5.19 5.62 5.27 5.25 4.86 5.25 4.80 5.00 4.50 4.00 3.44 4.00 3.38
8.00                                                 6.62 6.27 6.00 5.62 6.00 5.54 6.00 5.50 5.00 4.44 5.00 4.38
9.00                                                 7.62 7.27 7.00 6.62 6.75 6.30 7.00 6.50 6.00 5.44 6.00 5.38
10.00                                                     8.00 7.62 7.75 7.30 8.00 7.50 7.00 6.44 7.00 6.38
11.00                                                         9.25 8.80 9.00 8.50 8.00 7.44 8.00 7.38
12.00                                                         10.25 9.80 10.00 9.50 9.00 8.44 9.00 8.38

Notes:

  • The basic thread lengths (LT) listed directly below the nominal sizes in the table above represents the nominal length up to which all screws of that diameter shall be fully threaded.
  • To determine the threaded portion of the screws with a nominal length greater than LT, subtract the minimum design grip length (LG) from the nominal length (L).
Socket Cap Screws : Performance & Mechanical Stats
 

Standard Head - Alloy Steel

Standard Head Socket Head Cap Screw

Standard Head - Stainless Steel

Standard Head Socket Head Cap Screw

Low Head - Alloy Steel

 Low Head Socket Cap Screw Profile Pic

Button Head - Alloy Steel

Button Socket Cap Screw 

Flat Head - Alloy Steel

Flat Socket Cap Screw Profile 
Descriptions An externally threaded fastener with unified threads, a cylindrical head (with a flat, chamfered top surface), knurled cylindrical sides and hexagonal recess. An externally threaded fastener with unified threads, a cylindrical head (with a flat, chamfered top surface), knurled cylindrical sides and hexagonal recess. Head height is 50% of a standard socket head and the socket size is smaller. Similar thread design as a socket cap screw, but the dome-shaped head is wider and has a lower profile. Similar to a button head socket screw, but with an 82-degree countersunk flat head.
Applications/Advantages Precision assembly work and applications requiring a well-tooled appearance. Greater tensile strength than same size Grade 5 or 8 hex head cap screws while requiring less surface area due to the internal wrenching. Stainless socket screws have less tensile and yield strength than alloy sockets, but superior corrosion resistance. They also retain mechanical and performance capabilities at higher than ambient temperatures. Useful in situations where clearance is limited. *Due to design constraints, low head cap screws cannot withstand same preloads as standard socket cap screws.  Used when a wider bearing surface or smoother, finished appearance is desired. Designed for light fastening applications. Not recommended for critical, high-strength applications. Used when a flush mount, high-strength screw is required. Often used for tools and dies where moving parts pass over an area.
Material
 Alloy steel with min 0.31% Carbon, max 0.040% Phosphorus, max 0.045% Sulfur and one or more of the following elements in sufficient quantity to meet strength requirements listed below: chromium, nickel, molybdenum or vanadium. 302, 303, 304, 305, 384, XM1, or XM7 alloy Alloy steel with min 0.31% Carbon, max 0.040% Phosphorus, max 0.045% Sulfur and one or more of the following elements in sufficient quantity to meet strength requirements listed below: chromium, nickel, molybdenum or vanadium. Alloy steel with min 0.28 to 0.50% Carbon, max 0.040% Phosphorus, max 0.035% Sulfur and one or more of the following elements in sufficient quantity to meet strength requirements listed below: chromium, nickel, molybdenum or vanadium. Alloy steel with min 0.28 to 0.50% Carbon, max 0.040% Phosphorus, max 0.045% Sulfur and one or more of the following elements in sufficient quantity to meet strength requirements listed below: chromium, nickel, molybdenum or vanadium.
Heat Treatment Oil quenching from above the transformation temperature, tempered at a temp. not lower than 650 degrees F. The only heat treatment normally available on austenitic stainless alloys is annealing, done at approx. 1900-degrees F to a dead soft condition and is not normally thermally reversible. Oil quenching from above the transformation temperature, tempered at a temp. not lower than 650 degrees F. Oil quenching from above the transformation temperature, tempered at a temp. not lower than 650 degrees F. Oil quenching from above the transformation temperature, tempered at a temp. not lower than 650 degrees F.
Hardness

0 - 1/2" D: Rockwell C39 min.

5/8" D & larger: Rockwell C37 min.

 Rockwell B80 min. Rockwell C38 min.

Rockwell C38 - 44

0 - 1/2" D: Rockwell C39 - 44

Over 1/2" D: Rockwell C37 - 44
Tensile Strength

0 - 1/2" D: 180,000 psi min.

5/8" D & larger: 170,000 psi min.

 80,000 psi min. 170,000 psi min.

180,000 psi min. (material only)

0 - 1/2" D: 145,000 psi min.

Over 1/2" D: 135,000 psi min.
Yield Strength

0 - 1/2" D: 162,000 psi min.

5/8" D & larger: 153,000 psi min.

 30,000 psi min. 150,000 psi min.

160,000 psi min. (material only)

153,000 psi min. (over 1/2" diam.)
Elongation 10% min (Applies to machined specimens at least 4D in length where D equals the nominal diameter of the screw.) 10% min (Applies to machined specimens at least 4D in length where D equals the nominal diameter of the screw.) 10% min (Applies to machined specimens at least 4D in length where D equals the nominal diameter of the screw.) 8% min (Applies to machined specimens at least 4D in length where D equals the nominal diameter of the screw.) 8% min (Applies to machined specimens over 1/2" diam., at least 4D in length where D equals the nominal diameter of the screw.)
Reduction of Area 33% min (machined specimens) 30% min (machined specimens) 33% min (machined specimens) 35% min (machined specimens)  35% min (machined specimen's over 1/2" diam.)

Button Head Socket Cap Screws: Dimensions & Mechanical Properties

Labeled Diagram of Button Socket Cap Screw Dimensions

Button Head Socket Cap Screw Dimensions & Mechanical Properties (Alloy Steel)                                                                                      ASME B18.3-2003
Nominal size Head Diameter (A)  Head Height (H) Head Side Height (S) Hex Socket Size (J)

Key Engage-ment (T)

  Fillet Transition Diameter (F) Max Standard Length (L) Tensile Test Load Single Shear Strength of Body Seating Torques (in./lbs.)
Max Min Max Min Ref Nom Min  Max Min Nom lb. lbs., min. Coarse Thread Fine Thread
4  0.213 0.201 0.059 0.051 0.015  1/16 0.035 0.132 0.50 0.50 840 950 7.0 8
6 0.262 0.250 0.073 0.063 0.015 5/64 0.044 0.158 0.63 0.63 1,260 1,400 13 15
8 0.312 0.298 0.087 0.077 0.015 3/32 0.052 0.194 0.75 0.75 1,940 2,000 25 26
10 0.361 0.347 0.101 0.091 0.020 1/8 0.070 0.220 1.00 1.00 2,440 2,700 45 48
1/4 0.437 0.419 0.132 0.122 0.031 5/32 0.087 0.290 1.00 1.00 4,430 4,700 95 110
5/16 0.547 0.527 0.166 0.152 0.031 3/16 0.105 0.353 1.00 1.00 7,300 7,300 190 210
3/8 0.656 0.636 0.199 0.185 0.031 7/32 0.122 0.415 1.25 1.25 10,800 10,600 300 300
1/2 0.875 0.851 0.265 0.245 0.046 5/16 0.175 0.560 2.00 2.00 19,800 18,800 900 960
5/8 1.000 0.970 0.331 0.311 0.062 3/8 0.210 0.685 2.00 2.00 31,500 29,400 1,700 1,900
Button Head Socket Cap Screws : Nominal Thread Length

Tolerance on Length

 Nominal Screw Size
 Nominal Screw Length
Up to 1" (Inclusive) Over 1" - 2-1/2" (Inclusive)
0 thru 3/8 (Inclusive) -.03 -.04
1/2 and 5/8 (Inclusive) -.03 -.06

Low Head Socket Cap Screws: Dimensions & Mechanical Properties

Low Head Socket Cap Screw Dimensions & Mechanical Properties (Alloy Steel)                                                                                      ASME B18.3-2003
Nominal size Basic Screw Diameter (D) Body Diameter (F)  Head Diameter (A) Head Height (H) Hex Socket Size (J)

Key Engage-ment (T)

  Tensile Strength (lbs./min) Tightening Torque (in./lbs.)
Max Min Max Min Max Min Min UNRC UNRF
8 0.1640 0.1640 0.1585 0.270 0.265 0.085 0.079 0.078 0.060 2,310 2,440 19.4
10 0.1900 0.1900 0.1840 0.312 0.307 0.098 0.092 0.094 0.072 2,890 3,300 33.5
1/4 0.2500 0.2500 0.2435 0.375 0.369 0.127 0.121 0.125 0.094 5,250 6,000 77.9
5/16 0.3125 0.3125 0.3053 0.437 0.431 0.158 0.152 0.156 0.110 8,650 9,550 156.0
3/8 0.3750 0.3750 0.3678 0.562 0.556 0.192 0.182 0.188 0.115 12,800 14,450 273.0
1/2 0.5000 0.5000 0.4919 0.750 0.743 0.254 0.244 0.250 0.151 23,400 26,350 615.0
Low Head Socket Cap Screws : Nominal Thread Length

Tolerance on Length

 Nominal Screw Size
 Nominal Screw Length
Up to 1" (Inclusive) Over 1" - 2-1/2" (Inclusive)
0 thru 3/8 -.03 -.04
1/2 -.03 -.06

Flat Head Socket Cap Screws: Dimensions & Mechanical Properties

Labeled diagram of alloy steel flat socket cap screw

Flat Head Socket Cap Screw Dimensions (Alloy Steel)                                                                                                              ASME B18.3-2003, Blue Devil

Nominal Size

 Body Diameter (D) Head Diameter (A) Head Height (H)

Protrusion Gage Diameter (G)

 Protrusion (P) Hex Socket Size (J) Key Engage-ment (T) Fillet Transi-tion Diam. (F) 

Tensile Strength

(lbs Min)

 Single Shear Strength of Body Recommended Seating Torques (in/lbs)
Max Min Theoretical Sharp Max Abs. Min Ref Max Min Max Min Nom Min Max UNRC UNRF lbs., Min Coarse Thread Fine Thread
4 0.1120 0.1075 0.255 0.218 0.083 0.172 0.174 0.049 0.036 1/16 0.055 0.136 900 - 940 8. -
5 0.1250 0.1202 0.281 0.240 0.090 0.196 0.195 0.051 0.037 5/64 0.061 0.153 1,185 - 1,180 12. -
6 0.1380 0.1329 0.307 0.263 0.097 0.220 0.219 0.052 0.037 5/64 0.066 0.168 1,350 - 1,440 15. -
8 0.1640 0.1585 0.359 0.311 0.112 0.267 0.266 0.055 0.039 3/32 0.076 0.194 2,085 - 2,030 30. -
10 0.1900 0.1840 0.411 0.359 0.127 0.313 0.312 0.058 0.041 1/8 0.087 0.220 2,610 2,610 2,720 40. 45.
1/4 0.2500 0.2435 0.531 0.480 0.161 0.424 0.423 0.064 0.043 5/32 0.111 0.280 4,750 4,750 4,710 100. 110.
5/16 0.3125 0.3053 0.656 0.600 0.198 0.539 0.538 0.070 0.047 3/16 0.135 0.343 7,800 7,800 7,360 200. 220.
3/8 0.3750 0.3678 0.781 0.720 0.234 0.653 0.652 0.076 0.050 7/32 0.159 0.405 11,600 11,600 10,600 350. 400.
7/16 0.4375 0.4294 0.844 0.781 0.234 0.690 0.689 0.092 0.063 1/4 0.159 0.468 15,900 15,900 14,400 560. -
1/2 0.5000 0.4919 0.938 0.872 0.251 0.739 0.738 0.119 0.087 5/16 0.172 0.530 21,200 21,200 18,850 850. 1,000.
5/8 0.6250 0.616 1.188 1.112 0.324 0.962 0.961 0.135 0.096 3/8 0.220 0.655 33,800 33,800 29,450 1,700 -
3/4 0.7500 0.7406 1.438 1.355 0.396 1.186 1.185 0.150 0.105 1/2 0.220 0.780 50,000 50,000 42,400 3,000 -
Flat Head Socket Cap Screws : Nominal Thread Length

Tolerance on Length

 Nominal Screw Size
 Nominal Screw Length
Up to 1" Over 1" - 2-1/2" Over 2-1/2" - 6"
0 thru 3/8 (Inclusive) -.03 -.04 -.06
7/16 thru 3/4 (Inclusive) -.03 -.06 -.08

 Labeled Diagram for Flat Head Socket Cap Screws Length Specifications

Body and Grip Lengths of Flat Head Socket Cap Screws                                                                                                                                         ASME B18.3-2003
Nominal Size 4 5 6 8 10 1/4 5/16 3/8 7/16 1/2 5/8 3/4
 LT Min. .750 .750 .750 .875 .875 1.000 1.125 1.250 1.375 1.500 1.750 2.000
LTT Max 0.99 1.00 1.05 1.19 1.27 1.50 1.71 1.94 2.17 2.38  2.82  3.25 
Nominal Length LGH LBH LGH LBH LGH LBH LGH LBH LGH LBH LGH LBH LGH LBH LGH LBH LGH LBH LGH LBH LGH LBH LGH LBH 
1.25 0.50 0.38 0.50 0.38 0.50 0.34 0.38 0.22                                
1.50 0.50 0.38 0.50 0.38 0.50 0.34 0.38 0.22 0.62 0.42                            
1.75 1.00 0.38 1.00 0.88 1.00 0.84 0.8 0.72 0.62 0.42 0.75 0.50                        
2.00 1.00 0.38 1.00 0.88 1.00 0.84 0.88 0.72 1.12 0.92 0.75 0.50 0.88 0.60                    
2.25         1.50 1.34 1.38 1.22 1.62 1.42 1.25 1.00 0.88 0.60 1.00 0.69                
2.50             1.38 1.72 2.12 1.92 1.75 1.50 1.38 1.10 1.00 0.69 1.12 0.77 1.00 0.62        
3.00                 2.62 2.42 2.25 2.00 1.88 1.60 1.50 1.19 1.62 1.27 1.00 0.62        
3.50                         2.38 2.10 2.00 1.69 2.12 1.77 1.75 1.36 1.50 1.04 1.50 1.00
4.00                         2.88 2.60 2.50 2.19 2.62 2.27 2.50 2.12 2.25 1.80 1.50 1.00
4.50                         3.38 3.10 3.00 2.69 3.12 2.77 2.50 2.12 2.25 1.80 2.50 2.00
5.00                         3.88 3.60 3.50 3.19 3.62 3.27 3.25 2.86 3.00 2.54 2.50 2.00
5.50                         4.38 4.10 4.00 3.69 4.12 3.77 4.00 3.62 3.75 3.30 3.50 3.00
6.00                         4.88 4.60 4.50 4.19 4.62 4.27 4.00 3.62 3.75 3.30 3.50 3.00

* Note: For screws of nominal lengths longer than those for which LGH and LBH values tabulated in this table and for screws over 1 inch in diameter, the maximum grip gaging length LGH and the minimum body length LBH of the screws shall be determined as follows: LGH = L - LT and LGH = L - LTT where L = nominal length, LT = minimum thread length, and LTT = maximum total thread length.